COLUMBUS, Ohio — A condemned Ohio inmate who weighs 480 pounds (218 kilograms) and has a history of difficulty losing weight argues he would face a “torturous and lingering death” if executed in January.

Ronald Post, who shot and killed a hotel clerk in northern Ohio almost 30 years ago, said his weight, vein access, scar tissue, depression and other medical problems raise the likelihood his executioners would encounter severe problems. He’s also so big that the execution gurney might not hold him, lawyers for Post said in federal court papers filed Friday.

Post, 53, is scheduled to die Jan. 16 for the 1983 shooting death of Helen Vantz.

A spokeswoman for the prisons department had no comment on the pending litigation.

Post’s attorneys also want more time to pursue arguments that claims of a full confession by the inmate to several people have been falsely exaggerated.

“Post’s case is about more than his weight, and his life should be spared for reasons wholly unrelated to his obesity,” his federal public defender, Joseph Wilhelm, said in a statement.

Inmates’ weight has come up previously in death penalty cases in Ohio and elsewhere.

In 2008, federal courts rejected arguments by condemned double-killer Richard Cooey that he was too obese to die by injection. Cooey’s attorneys had argued that prison food and limited opportunities to exercise contributed to a weight problem that would make it difficult for the execution team to find a viable vein for lethal injection.

In 2007, it took Ohio executioners about two hours to insert IVs into the veins of condemned inmate Christopher Newton, who weighed about 265 pounds (120 kilograms). A prison spokeswoman at the time said his size was an issue.

In 1994 in Washington state, a federal judge upheld the conviction of Mitchell Rupe, but agreed with Rupe’s contention that at more than 400 pounds (180 kilograms), he was too heavy to hang because of the risk of decapitation. Rupe argued that hanging would constitute cruel and unusual punishment.

After numerous court rulings and a third trial, Rupe was eventually sentenced to life in prison, where he died in 2006.

Medical personnel have had a hard time inserting IVs into Post’s arms, according to the court filing. Four years ago, an Ohio State University medical centre nurse needed three attempts to insert an IV into Post’s left arm, the lawyers wrote.

Post has tried losing weight, but knee and back problems have made it difficult to exercise, according to his court filing.

Post’s request for gastric bypass surgery has been denied, he’s been encouraged not to walk because he’s at risk for falling, and severe depression has contributed to his inability to limit how much he eats, his filing said.

While at the Mansfield Correctional Institution, Post “used that prison’s exercise bike until it broke under his weight,” according to the filing.